Leases - Future Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Operating Leases
2019	$ 7,480
2020	7,532
2021	7,583
2022	7,635
2023	7,689
Thereafter	79,789
Total lease payments	117,708
Less: interest	(59,904)
Present value of lease obligations	57,804	$ 58,663
Finance Leases
2019	2,357
2020	2,357
2021	2,413
2022	2,453
2023	2,453
Thereafter	135,607
Total lease payments	147,640
Less: interest	(120,575)
Present value of lease obligations	$ 27,065	$ 27,010